karmada-search cannot collect resource information of newly added clusters

[luoMonkeyKing]

What happened: I added a new cluster member3, but the resources in member3 cannot be queried through karmada-search.

targetCluster configuration in ResourceRegistry：

  targetCluster:
    exclude:
    - host

karmada-search logs:

Environment:

• Karmada version: v1.2.0

[XiShanYongYe-Chang]

/cc @liys87x Can you help take a look? Have we not created an informer for the newly added cluster?

[fly2F]

@luoMonkeyKing @XiShanYongYe-Chang I'll follow this issue

[XiShanYongYe-Chang]

@luoMonkeyKing @XiShanYongYe-Chang I'll follow this issue

Thanks~